FR2899874A1 - Corrugated board support element for e.g. girder of pallet, has inner and outer strips including respective upper edges forming smaller side of profile, and coupling unit coupling element with another element by fitting - Google Patents

Abstract

The element (1) has a transversal sectioned trapezium shaped profile including three outer strips (4, 5, 7) that are connected by roll lines, where the strips (5, 7) form respective sides of the profile and the strip (4) forms a base of the profile. The profile has two inner reinforcing strips (6, 9) arranged inside the profile and supported on the base. Upper edges of the inner strips with upper edges of the outer strips form a smaller side of the profile. A coupling unit couples the element (1) with another support element by a fitting (18) and is situated opposite to the base. An independent claim is also included for a precut or repressed matrix board comprising a longitudinal central part.

Description

Support element of foot or spar type, particularly for pallet

  The present invention relates to a support element made of semi-rigid material, assembled in foot or spar for pallet or packaging. Numerous solutions have already been proposed to produce, in semi-rigid material such as cardboard or corrugated cardboard, handling pallets of semi-rigid material. Thus FR-A-2,836,454 patent application describes a handling pallet comprising at least two longitudinal members each obtained by folding a panel of a semi-rigid material such as corrugated cardboard, and a plate in other semi-rigid material. Patent EP-B 1-0 701 521 describes a generally rectangular pallet comprising at least one longitudinally extending cross member, and at least one pair of reinforcements extending transversely with respect to said cross member, each reinforcement and the crossmember having interengaging notches, the crossmember having a substantially trapezoidal cross-section with an upper edge wider than the lower edge, the reinforcements having substantially the same trapezoidal cross-section as the crossbeam but being inverted with respect to the crossmember, the upper edge of the cross member and the upper edges of the reinforcements being substantially coplanar. But this solution has drawbacks, because the inversion of the reinforcements on the cross member is by simple embedding, and therefore is not very solid compared to pallet loads, especially in case of involuntary movement parallel to the ground. In addition, it requires a folding by doubling in the opposite direction, which is complicated to implement with conventional manufacturing machines.

  The patent application FR-A 1-2,861,699 describes a cardboard pallet structure consisting of at least two parallel beams associated with an upper support plate, the two beams each having two side walls and two parallel horizontal walls. , one lower and the other upper, defining a tetrahedral internal space E. The beams further comprise two internal stiffening flaps in the form of dihedron, which extend in the internal space E. None of the walls and no flaps is

  substantially perpendicular to the ground or support, which makes this realization less solid than the embodiments with wall or flap substantially perpendicular to the ground or support. In addition, this solution is not scalable.

  The present invention aims to overcome these drawbacks of the prior art in a simple way, by making it possible to produce a very strong support element, making it possible to produce feet, especially for pallets or packaging, and longitudinal members. For this purpose, the subject of the invention is a support element made of semi-rigid material such as cardboard or corrugated board or similar material, characterized in that the support element consists of a single sheet of folded cardboard material. several times on itself parallel to a longitudinal axis, so as to form at each of its ends a cross-sectional section formed substantially trapezoidal, said section being divided into two adjacent half-profiles which are joined on the axis of symmetry longitudinal section of the support element, the profile comprising three external bands connected by two fold lines, two of the external bands being arranged obliquely forming two sides of the trapezium, and the other outer band forming the base of the trapezium intended to bear on the floor or a support, said profile further comprising at least two internal reinforcement strips juxtaposed and arranged inside the trapezium perp endiculately at the base and resting on the base, and the upper edges of which (i.e. opposed to the base) form with the upper edges of the two external strips arranged obliquely the short side of the trapezoid formed by the profile, said support member further comprising at least one means of connection by embedding with another support member, said means nesting connection being located opposite the base.

  Advantageously according to the invention, said support element is flexible, and its manufacturing process is by simple folding by abutment, which is very easily achievable by the usual manufacturing machines. Preferably according to the invention, the support element is characterized in that it comprises two or four internal reinforcement strips, preferably four internal reinforcement strips. This advantageously makes it possible to solidify the support element.

  According to one embodiment of the invention, the support element is characterized in that the embedding connection means comprises an opening formed of a recessed portion from the upper part of the obliquely arranged external strips, and at least two teeth arranged on each of the inner strips and on each of the obliquely arranged outer strips. This allows very advantageously to have a way of setting extremely strong relationships, and almost insensibly to unwanted movements, especially in case of involuntary movement parallel to the ground. The invention also relates to a foot consisting of two support elements, each support element being according to the invention, comprising a single means of connection by embedding and being of short length relative to the length of its transverse part, the foot being characterized in that the first support member and the second support member are arranged head to tail relative to each other, the first support member being adapted to be disposed on the ground or a support resting on its base, and the second a support element being embedded in the first support element by the combination of their interlocking connection means, so as to present its base on the side opposite the ground or a support, parallel to the base of the first element, the base of the second support member being located in the plane of the small trapezoid sides of the ends of the first support member. Such a foot is very strong and easy to perform.

  Preferably, the foot according to the invention is such that it further comprises at least one reinforcing top sheet disposed on the base of the second support member and secured to said base, said reinforcing top sheet being substantially of the same surface as said based. This advantageously makes it possible to increase the strength of said foot.

  Preferably, the foot according to the invention further comprises at least one holding means for said foot intended to be inserted into a bottom flap of a package. In this case, the invention also relates to a package comprising at least one, preferably at least four, of these feet. The invention furthermore relates to a support element as described above, which comprises a longitudinal part of very great length. in relation to the length of its transverse part,

  an elongated support member having at least two, preferably three, recess-engaging means with another support member having only one recess-engaging means and short-length relative to the length of its transverse portion. Such an elongate support member is also called a spar, and the other support member is said to be short. The invention furthermore relates to a beam comprising at least one elongated support element as described above, associated with at least two, preferably at least three, support elements according to the invention, comprising a single means of connection by embedding and short length relative to the length of its transverse portion, by the means (s) for setting in relation by embedding that they comprise, the elongate support member and each of the other short support elements being arranged head to tail one relative to each other, and each of the short support members being recessed by the combination of its embedding connection means and the recess connecting means of the elongated support member and resting on its base on the or a support, the base of the short elements forming the base of the beam, the elongated support member being such that its base is in a plane parallel to the ground or the support and in the plane of the small trapezoid sides of the ends of the elongated support member. Such a beam is advantageously particularly solid. The invention also relates to a handling pallet comprising at least two, preferably three, beams according to the invention, said beams being arranged substantially parallel to each other along their longitudinal axis, and the pallet further comprising a plate of a material semi-rigid material such as corrugated cardboard, said material being identical to or different from the material common to the short support members and to the elongated support member which form the beam, said plate being fixed, for example by bonding, to the beams, on the opposite side at their base. The invention finally relates to a blank for a support element according to the invention such that the single sheet comprises symmetrically, on each of the two sides of a longitudinal central part, at least two, preferably two or three, fold lines intended for be shaped in a fold direction which is the same for the said first two

  lines from the central part, the fold directions being alternately reversed from the third fold line from the central part, if present, said fold lines defining, from the central part, at least two, preferably two or three, strips on each side, said strips being shaped to form a half profile on each side of the central portion, and said strips each having at least one opening associated with at least one tooth so as to conform the connection means by embedding.

  Various embodiments of the invention will be described hereinafter by way of example. In this description, reference is made to the appended FIGS. 1 to 15, in which: FIG. 1 is a perspective top view of a blank of pre-cut and reprocessed cardboard intended for the production of a first support element. FIGS. 2, 3 and 4 are perspective top views illustrating the production of the first support element from the blank of FIG. 1, until the first support element of FIG. 4 is obtained. FIG. top perspective view of a foot made from the first support member of Figure 4 and a second support member. FIG. 6 is a perspective top view of a precut and corrugated corrugated cardboard blank for the production of a third support member. FIG. 7 is a top view in perspective of a third support element coming from the blank of FIG. 6. FIG. 8 is a top view in perspective of a pre-cut and repressed corrugated cardboard blank intended for the production of an elongated support member or spar. FIG. 9 is a top view in perspective of an elongate support member from the blank of FIG. 8. FIG. 10 is a top view in perspective of a beam according to the invention made from the support element. FIG. 11 is a perspective view from above of FIG. 1 and is a perspective view from above of FIG.

  execution of a beam according to the invention. FIG. 12 is a top view in perspective of a pallet according to the invention made from three beams of FIG. 10. FIG. 13 is a perspective top view of a foot according to the invention made from FIG. 14 is a top view in perspective of a package according to the invention on which four legs of FIG. 13 are mounted. FIG. 15 is a perspective bottom view of FIG. Figure 16 is a top view in perspective of a blank of pre-cut corrugated cardboard for the production of a fourth support member. FIG. 17 is a top view in perspective of a fourth support element coming from the blank of FIG. 16. FIG. 1 is a top view in perspective of a blank 10 of pre-cut and reprocessed cardboard intended for the production of a first support element 1. The mounting of this first support element 1 is shown schematically in FIGS. 2 and 3, from the blank 10 of FIG. 1 until the production of the support element 1 of FIG. support element 1 is a symmetrical part of longitudinal axis Y'Y, which is an axis of symmetry, of axis X 'X, transverse to the axis Y'Y, which is an axis of symmetry and axis substantially vertical Z'Z, when the support member 1 is placed on a base 4 as shown in Figure 4.

  The blank 10 of Figure 1 is formed of a single sheet which comprises symmetrically, on each of the two sides of a central portion 4 which is intended to become the base 4 of the support member 1, three strips made by three lines folds parallel from the central strip, the fold lines being parallel to the axis which will be the axis Y'Y. On each side of the central strip 4, the first two lines of folds starting from said central strip 4 are intended to be shaped in the same direction of folding, the fold direction being reversed for the third fold line. The fold lines define three strips on each side, said strips being shaped so as to form a half section on each side of the central portion 4 and said strips having at least one opening associated with at least one tooth so as to form a means of

  Digitization by embedding 18. Thus the strip 7 adjacent to the strip 4 has an opening 7a and two teeth 12 of small size. The band 9 adjacent to the band 7 has an opening 9a and two teeth of larger size 11. The band 3 adjacent to the band 9 has an opening 3a and two teeth 11. Similarly, symmetrically with respect to the central band 4, the strip 5 is symmetrical with the strip 7 with respect to the central strip 4 and has an opening 5a and two teeth 12. The strip 6 is symmetrical with the strip 9 with respect to the central strip 4 and comprises an opening 6a and two teeth 11. The strip 8 is symmetrical with the strip 3 with respect to the central strip 4 and has an opening 8a and two teeth 11. The manner in which the blank 10 is folded is indicated in FIG. 2 and then in FIG. 4 is a top view in perspective of the support member 1 according to the invention. Said support element 1 is made of semi-rigid material such as cardboard, corrugated cardboard or a similar material. The support element 1 consists of a single sheet 10 folded several times on itself parallel to the longitudinal axis Y'Y. The support member 1 is at each of its ends a cross sectional section formed substantially trapezoidal. The profile is divided into two adjacent half-sections which are united on the longitudinal axis of symmetry Y'Y of the support element 1, the profile comprising the three external strips 5, 4 and 7 connected by two fold lines, two of the external strips 5 and 7 being arranged obliquely forming two sides of the trapezium, and the other outer strip 4 being the base of the trapezium intended to bear on the ground or a support. The profile further comprises the four internal reinforcement strips 6, 8, 9 and 3 which are juxtaposed and arranged inside the trapezium perpendicular to the base 4 and resting on this base 4. The upper edges of these four internal bands 6, 8, 9 and 3, that is to say opposite to the base 4, form with the upper edges of the two outer strips 5 and 7 the short side of the trapezoid formed by the profile. According to the invention, the support element 1 further comprises at least one recessing connection means 18 which is formed of all the openings 8a, 6a, 5a, 7a, 9a and 3a, of eight teeth 11 and four teeth 12. Figure 5 is a perspective top view of a foot 13

  made from the first support member 1 of Figure 4 and a second support member 2. The support member 1 is based on 4, and the support member 2 is based on 4 '. The two support elements 1 and 2 are recessed to form a foot 13, the first support member 1 and second support member 2 being arranged head to tail. The first support element 1 is disposed on the ground or a support, resting on its base 4, and the second support element 2 is embedded in the first support element 1 by the combination of their two means of connection by embedding, of so as to present its base 4 'on the opposite side to the ground or the support and parallel to the base 4 of the first support member 1, the base 4' of the second support member 2 being located in the plane of the small trapezoid sides of the ends of the first support element 1. The two support elements 1 and 2 are support elements which comprise a single element for fitting in relation by embedding and which are of short length along the axis Y'Y relative to the length of their transverse portions X ' X. These are so-called short support elements. FIG. 6 is a view from above in perspective of a pre-cut corrugated blank 14 of corrugated cardboard intended for the production of a third support element 15. The blank 14 is very close to the blank 10, except for the fact that bands 3 and 8 are not present. Thus the blank 14 comprises a central strip 4. On one side of this central strip 4, bound by lines of parallel folds, is a strip 7, adjacent to the central strip 4 and having an opening 7a and two teeth 12 then a band 9, adjacent to the band 7, having an opening 9a and two teeth 11. On the other side of the central band 4, the band 5 is symmetrical with the band 7 with respect to the central band 4, and has an opening 5a and two teeth 12. The band 6 is symmetrical with the band 9 with respect to the central band 4, and has an opening 6a and two teeth 11. If one bends, in the same way as indicated in Figures 2 and 3 for the blank 10, the blank 14 of Figure 6, there is obtained a support member 15 having a connection means by embedding 18 'formed of four teeth 11 and four teeth 12, and openings 6a, 5a, 7a and 9a. This support element 15 has only two internal bands, unlike the support elements 1 and 2 which comprise four internal bands. This support element 15 is advantageously a more economical version to

  realize that the previous version of the support elements 1 and 2. The support elements 1 and 2 are advantageously a stronger version than the support member 15. Figure 8 is a top view in perspective of a blank 16 of pre-cut corrugated cardboard and repressed for the realization of an elongated support member 17 or spar. The blank 16 comprises a central band 36 around which are articulated two bands symmetrical with respect to the band 36 which are the strips 39 and 40, two strips 38 and 41, symmetrical with respect to the band 36, the band 41 being adjacent. at the band 40 and the band 38 being adjacent to the band 39, then two symmetrical bands 37 and 35, symmetrical with respect to the band 36, the band 37 being adjacent to the band 38 and the band 35 being adjacent to the band 41 The fold lines between the successive bands 37, 38, 39, 36, 40, 41 and 35 are all parallel. Each strip comprises three parts, delimited perpendicular to the fold lines between the successive bands, said parts having openings and teeth according to the invention, all of said parts being the three large non-adjacent bands 101, 102, 103. Each strip has two parts, delimited perpendicularly to the fold lines between the successive bands, solid and without openings, all of said parts being the two large strips not adjacent to each other 161 and 162. Large strips are arranged in large adjacent bands 101, 161, 102, 162 and 103. The large band 101 is described in more detail below. The strip 10 is such that each of the strips 37, 38, 39, 40, 41 and 35 respectively comprises an opening 37a, 38a, 39a, 40a, 41a and 35a. The strips 40 and 39, which will be intended to form oblique external bands, comprise teeth 12 of smaller size than the four internal bands 37, 38, 41, and 35 which comprise teeth 11. The shaping is similar to the one previously explained for the support elements 1, 2 and 15. FIG. 9 is a top view in perspective of an elongated support element 17 coming from the blank 16 of FIG. 8. It is an elongated longitudinal member or support element 17, which comprises three interlocking connection elements 19, 20 and 21. FIG. 10 is a perspective top view of a beam

  180 according to the invention made from the elongate support member 17 of Figure 8 and three first support elements 1 of Figure 5. The support member 17 is associated with the three short support members 1 by the setting means recess relationship 19, 20 and 21 that includes the elongated support member 17, and the recess linking means 18 that comprises each support member 1. The three support members 1 rest on the ground or a support by their base 4 and are arranged head to tail compared. to the elongate support member 17. The elongate support member 17 is such that its base 36 is in a plane parallel to the ground or support and in the plane of the small trapezoid sides of the ends of the elongate support member 17. The Figure 11 is a top view in perspective of another embodiment of a beam 180 'according to the invention. With respect to the beam 180 of Figure 10, the beam 180 'has additional recesses 18'1 and 18'2. Advantageously, these recesses make it possible to produce a more economical version, and especially to let the forks of pallet trucks or other gripping means pass in order to transport a pallet which can be made from at least one of these beams.

  Figure 12 is a top view in perspective of a pallet 22 according to the invention made from three beams 180 of Figure 10, the three beams 180 being disposed substantially parallel to each other along their longitudinal axis. The pallet '22 further comprises a plate 23 of a semi-rigid material such as corrugated cardboard, said material being identical to or different from the material common to the short support members 1 and the elongated support member 17 which form the beam 180. The plate 23 is fixed for example by gluing to the beams on the side opposite their base. But any other attachment means known to those skilled in the art can be used.

  FIG. 13 is a view from above in perspective of a foot 24 according to the invention made from two first support members 1 of FIG. 4. With respect to the foot 13 of FIG. 5, the foot 24 represented in FIG. 13 further comprises a top sheet 23 of reinforcement disposed on the base 4 'of the support member 2 and secured to said base 4' for example by gluing. The reinforcing sheet 23 is substantially of the same surface as the base 4 ', but it also comprises four holding means 23a, 23b, 23c and 23d of said foot 24

  intended to be inserted into at least one bottom flap of a package. FIG. 14 is a view from above in perspective of a package 26 according to the invention placed on its top on which four feet 24 are being mounted as shown in FIG. 13.

  The package 26 has four flaps 27, 32, 33 and 34 for forming a bottom. The flaps 33 and 32 which are folded first to form the bottom, then the flaps 27 and 34 are folded partially on the flaps 32 and 33. The flap 34 has two openings 30 and 31, each of the openings 30 and 31 being intended for The flap 27 has two openings 28 and 29, each of the openings 30 and 31 being intended for insertion of a foot 24. It can be seen that the feet 24 can be inserted into the openings 28, 29, 30 and 31 before the flaps 27 and 34 are folded, then the flaps 27 and 34 are folded with the feet inserted into their openings 28, 29, 30 and 31, and held on the bottom by means of holding 23a, 23b, 23c and 23d of each foot 24 and the presence of the flaps 32 and 33 The bottom is formed of four flaps 33, 32, 2I, and 34 of the package 26 and comprises four feet 24. Means such at least one bonding means or any other means known to those skilled in the art can be be associated with maintaining the feet 24 in said bottom. FIG. 15 shows a bottom view in perspective of the package 26 comprising the four legs 24 associated with the flaps 34 and 27. FIG. 16 is a perspective top view of a blank 14 'of pre-cut corrugated cardboard intended for . the production of a fourth support element. The blank 14 'is very close to the blank 14 of FIG. 6. With respect to the blank 14 of FIG. 6, the blank 14' comprises two additional strips, symmetrical with respect to the central band 4, which are the strip 43, adjacent to the band 6, and the band 42, adjacent to the band 9. The bands 42 and 43 do not have ap. FIG. 17 is a top view in perspective of a fourth support element 15 'coming from the blank 14' of FIG. 16. Compared to the support element 15 of FIG. 7, this support element 15 'comprises the two bands 42 and 43, advantageously reinforcing the base constituted by the central strip 4.

Claims (12)

  1. Support element (1,15,17) of semi-rigid material such as cardboard or corrugated board or similar material, characterized in that the support element (1,15,17) consists of a single sheet of cardboard material folded several times on itself parallel to a longitudinal axis (Y'Y), so as to form at each of its ends a sectional section formed substantially trapezoidal, said section being divided into two half-sections adjacent to each other on the longitudinal axis of symmetry (Y'Y) of the support member (1,15,17), the profile having three external bands (5,4,7, 39,36,40) connected by two fold lines, two of the outer strips (5,7; 39,40) being arranged obliquely forming two sides of the trapezium, and the other outer band (4, 4 ', 36) forming the base (4, 4', 36) of the trapezium intended to rest on the ground or a support, said profile also comprising at least two internal bands (6, 9; , 9.3, 38, 37, 35, 41) juxtaposed and arranged inside the trapezium perpendicular to the base (4, 4 ', 36) and resting on the base (4, 4', 36) , and whose upper edges (ie opposed to the base) form with the upper edges of the two external strips (5,7; 39,40) disposed obliquely the short side of the trapezium formed by the profile, said support member (1,15,17) further comprising at least recess-engaging means (18, 18 ', 19, 20, 21) with another support member, said recess-engaging means (18, 18', 19, 20, 21) being located at opposite the base (4, 4 ', 36).   2. support element (1, 15, 17) according to claim 1 characterized in that it comprises two (6, 9) or four (8, 6, 9, 3; 38, 37, 35, 41) internal strips of reinforcement, preferably four (8, 6, 9, 3; 38, 37, 35, 41) internal reinforcement strips.   3. support element (1, 15, 17) according to one of claims 1 or 2, characterized in that the means for setting in relation by embedding (18, 18 '; 19, 20, 21) comprises an opening formed of a portion recessed from the top of the obliquely disposed outer strips, and at least two teeth (11, 12) disposed on each of the inner strips (8, 6, 9, 3; 38, 37, 35, 41 ) and on each of the external strips (5, 7, 39, 40) arranged obliquely.   4. Foot (13, 24) consisting of two support elements (1, 2), each support element (1, 2) being according to one of claims 1 to 3, comprising a single means (18) for connecting by recess and being of short length (Y'Y) relative to the length of its transverse portion (X'X), the foot (13,24) being characterized in that the first support member (1) and the second support member (2) are arranged head to tail relative to each other, the first support member (1) being intended to be arranged on the ground or a support resting on its base (4), and the second support member (2). ) being embedded in the first support element (1) by the combination of their interlocking connection means, so as to have its base (4 ') on the side opposite the ground or a support, parallel to the base (4). ) of the first element, the base (4 ') of the second support element (2) being located in the plane of the short trapezoid sides of the ends s of the first support element (1).   5. Foot (24) according to the preceding claim as it further comprises at least one upper reinforcing sheet (23) disposed on the base (4 ') of the second support member (2) and secured to said base (4'). ), said upper reinforcing sheet (23) being substantially the same surface as said base (4 ').   6. Foot (24) according to one of claims 4 or 5 further comprising at least one holding means (23a, 23b, 23c, 23d) of said foot (24) to be inserted into a flap (27, 34) bottom of a package (26).   7. Packaging (26) comprising at least one, preferably at least four, foot (s) (24) according to the preceding claim.   8. Support element (17) according to one of claims 1 or 2 which comprises a longitudinal portion of very great length (Y'Y) relative to the length of its transverse portion (X'X), said elongated support member ( 17) having at least two, preferably three, recess-engaging means (19, 20, 21) with another support member (1) having a single recess-matching means (18) and a short length (Y'Y) relative to the length of its transverse part (X'X).   9. Beam (180, 180 ') comprising at least one elongated support element (17) according to the preceding claim associated with at least two, preferably at least three, support elements (1) according to one of claims 1 to 3, having only one recess-engaging means (18) and short length (Y'Y) relative to the length of its transverse portion (XX), by the one or more recess-engaging means (20); 19, 20, 21), the elongated support member (17) and each of the other short support elements (1) being arranged head to tail with respect to each other, and each of the support elements (1 ) short being recessed by the combination of its means of connection by embedding and the means for setting in relation by embedding the elongate support member (17) and resting on its base on the ground or a support, the base of short elements (1) forming the base of the beam (180), the elongate support member (17) so that its base (36) is in a plane parallel to the ground or the support and in the plane of the small trapezoid sides of the ends of the elongate support member (17).   10. Pallet (22) handling comprising at least two, preferably three, beams (180) according to the preceding claim, said beams (180) being arranged substantially parallel to each other along their longitudinal axis, and the pallet (22) further comprising a plate (23) of a semi-rigid material such as corrugated cardboard, said material being the same as or different from the material common to the short support members (1) and the elongated support member (17) which form the beam said plate (23) being fixed, for example by gluing, to the beams (180) on the opposite side to their base.   11. Flan (10, 14, 16) for support element (1,15,17) according to one of claims 1 to 3 such that the single sheet comprises symmetrically, on each of the two sides of a central longitudinal portion ( 4.36), at least two, preferably two or three, fold lines intended to be shaped in a fold direction which is the same for said first two lines from the central part (4, 36), the directions folds being alternately inverted from the third fold line from the central portion (4, 36), if present, said fold lines defining, from the central portion (4, 36), at least two, preferably two or three, strips (8, 6, 5, 7, 9, 3, 6, 5, 7, 9, 39, 38, 37, 40, 41, 35) of each side, said strips (8, 6, 5, 7, 9, 3, 6, 5, 7, 9, 39, 38, 37, 40, 41, 35) being shaped to form at least half a profile on each side of the portion central (4, 36), and said band s (8, 6, 5, 7, 9, 3; 6, 5, 7, 9; 39, 38, 37, 40, 41, 35) each having at least one opening (8a, 6a, 5a, 7a, 9a, 3a, 6a, 5a, 7a, 9a, 39a, 38a, 37a, 40a, 41a, 35a ) associated with at least one tooth (11,   12) so as to conform the embedding connection means (18).